Special Segment: Contact confessions

Millions of Americans wear contact lenses daily but some bad habits could cause incurable infections or even blindness.

Optometrist Sheri Mcgurk is shocked by the results of a study from the University Of Texas Southwestern Medical Center which claims of the 30 million contact lens wearers in the US, 99 percent are doing something wrong.

Erika Avery confesses to one of the top offenses.

"I've fallen asleep in them when I shouldn't have," she said.

Eye experts say the danger in doing that is you're cutting off oxygen to your eyes.

Infections and bacterial ulcers can quickly develop.

Also, the most commonly worn contact lens are soft and they can absorb toxins and bacteria when not used properly.

Dr. Michael Saidel is a cornea expert at University of Chicago Medicine.